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| United States Patent |
5,344,286
|
|
Schafer
, et al.
|
September 6, 1994
|
Centrifugal pump housing
Abstract
The invention relates to a longitudinally divided housing (1) of a flow
machine. The lower part (3) of the housing (1) is provided with facets
(10-13) in the region of the flange segment (4) and on the pump legs
(8,9). The facets (10-13), which are located in planes intersecting the
shaft axis and perpendicular thereto, serve as abutments upon attachment.
| Inventors:
|
Schafer; Horst (Rhade, DE);
Beiss; Gunter (Bremen, DE)
|
| Assignee:
|
KSB Aktiengesellschaft (Frankenthal/Pfalz, DE)
|
| Appl. No.:
|
573036 |
| Filed:
|
August 24, 1990 |
| PCT Filed:
|
February 10, 1989
|
| PCT NO:
|
PCT/EP89/00124
|
| 371 Date:
|
August 24, 1990
|
| 102(e) Date:
|
August 24, 1990
|
| PCT PUB.NO.:
|
WO89/08194 |
| PCT PUB. Date:
|
September 8, 1989 |
Foreign Application Priority Data
| Current U.S. Class: |
415/213.1; 415/214.1 |
| Intern'l Class: |
F01D 025/24; F01D 025/28 |
| Field of Search: |
415/213.1,214.1,182.1
248/671,676
|
References Cited
U.S. Patent Documents
| 704038 | Jul., 1902 | Hope | 415/214.
|
| 1886035 | Nov., 1932 | Mann | 415/213.
|
| 2850228 | Sep., 1958 | Rowley | 415/213.
|
| 2850262 | Sep., 1958 | Sprouse | 415/182.
|
| 2929218 | Mar., 1960 | Yates | 415/213.
|
| 3776660 | Dec., 1973 | Anderson et al. | 415/182.
|
| 3791760 | Feb., 1974 | Lipe | 415/182.
|
| 3799482 | Mar., 1974 | Bellati et al. | 415/213.
|
| 3847504 | Nov., 1974 | Martin | 415/214.
|
| 3891345 | Jun., 1975 | Doolin | 415/213.
|
| 4900224 | Feb., 1990 | Timperi et al. | 415/213.
|
| Foreign Patent Documents |
| 385893 | Feb., 1932 | BE.
| |
| 488377 | Sep., 1918 | FR.
| |
| 1639 | Jan., 1913 | GB.
| |
| 190894 | Jan., 1923 | GB.
| |
| 317660 | Aug., 1929 | GB.
| |
Primary Examiner: Look; Edward K.
Attorney, Agent or Firm: Darby & Darby
Claims
We claim:
1. A centrifugal pump comprising a housing; and a shaft rotatable in said
housing about a predetermined axis, said housing being divided parallel to
said axis and including an upper part and a lower part, said parts
including flange segments and said lower part further including suction
and pressure nozzles and legs serving for installation, said lower part
further including facets which serve as abutments upon attachment of
additional components and include facets at the respective flange segment
and facets at said legs, said facets being located in planes which
intersect and are perpendicular to said axis and said legs being disposed
opposite one another in the direction of said axis and being provided with
a force-transmitting and torque-transmitting connection.
2. The pump of claim 1, wherein said facets include facets on said legs.
3. The pump of claim 1, wherein said facets include at least one facet on
at least one of said nozzles.
4. The pump of claim 1, wherein said facets include pairs of facets and the
facets of at least one of said pairs are disposed opposite one another.
5. The pump of claim 1, wherein the facets at the flange section of said
lower part include masses of material.
6. The pump of claim 1, wherein said legs are connected to one another by
at least one insert.
7. The pump of claim 1, wherein said legs are connected to one another by
at least one adjusting element.
8. The pump of claim 1, wherein said legs have openings for tie rods.
9. The pump of claim 1, wherein said facets have fastening means.
Description
BACKGROUND OF THE INVENTION
The invention relates to a centrifugal pump of the type having a housing
which is divided parallel to the shaft axis and comprises upper and lower
housing parts provided with flange segments, the lower housing part having
suction and pressure nozzles and being provided with legs.
Such centrifugal pumps, which are very readily accessible for eventual
repairs and are generally equipped with double flow impellers, include a
longitudinally divided pump housing with a shaft which is journalled at
both ends. Since the suction and pressure nozzles are located below the
plane of the shaft, the centrifugal pump housing must not be removed from
the pipe for inspection or repair. By lifting off the upper part of the
housing, the rotating components become easily accessible and can be
removed without difficulty. A drawback of this design is the connection
between pump and motor which requires a particularly stable foundation,
frame or the like, as well as precise alignment of pump and motor, to
ensure reliable operation with little wear.
A centrifugal pump with a housing divided parallel to the shaft axis is
known from the French Publication No. 488.377. The lower part, which
includes the suction and pressure nozzles, is provided with a base plate
which also supports the bearings for the pump shaft. Installation of the
pump at the erection site is made possible by means of the base plate, and
particularly the lower side.
The Belgian Publication No. 385893 likewise shows a longitudinally divided
housing. The front sides of the lower housing part are provided with
mounting surfaces which serve to attach holders for the shaft bearings.
Additional supports permit installation of the housing on a frame formed
from double T-shaped carriers.
OBJECTS OF THE INVENTION
It is an object of the invention to develop an economical, longitudinally
divided pump housing which can be coupled to a motor and can provide
versatility in pump installation.
SUMMARY OF THE INVENTION
The above and other objects of the invention are accomplished by the
provision of a centrifugal pump wherein facets which serve as abutments
upon attachment are provided on the lower housing part in the region of
the respective flange segment and at the pump legs. The facets are located
in planes which intersect the shaft axis and are perpendicular thereto.
The legs are disposed opposite one another in the direction of the shaft
axis and are provided with a force-transmitting and torque-transmitting
connection.
In this manner, a motor can very easily be indirectly or directly secured
to a housing of this type by means of a flanged connection. If those sides
of the housing with the shaft bearings are designated the front sides of
the housing, then these are provided with facets in the region of the
flange segment. The legs of the pump are likewise provided with facets.
The facets serve as abutments upon attachment of additional components.
Thus, by means of a flanged connection, a motor casing can be secured to
the lower part of the housing with four-point engagement in the region of
the flange segment and the pump legs. Since the pump legs which are
located opposite one another in the direction of the shaft axis have a
force-transmitting and torque-transmitting connection, deformation of the
lower housing part with accompanying impairment of shaft journalling is
largely eliminated. The forces can be directly conducted into a
foundation, frame or the like at the other front side of the housing. By
virtue of the exclusive attachment to the lower housing part, the
advantage of longitudinally divided pump housings is retained without
change. In the event of an inspection or the like, the lower housing part
with its connecting flanges can remain directly in the pipe and the motor,
which is secured to the lower housing part by a flanged connection, need
not be removed. Nevertheless, it is possible to open the housing without
problem. The force-transmitting and torque-transmitting connection of the
pump legs disposed opposite one another in the direction of the shaft axis
can be such that these are formed in pairs as a one-piece cast part. This
gives rise to the possibility of direct, linear force transmission. Such
possibility does not require a specially equipped housing. Rather, a lower
housing part provided with facets of this type can be used for all
applications, e.g., for conventional horizontal installation. A pump
housing making it possible to achieve versatility in installation is
accordingly produced with simple means.
According to another embodiment of the invention, the pump legs and/or the
suction and pressure nozzles are provided with facets which serve as an
abutment upon attachment. The facets are located in planes which intersect
the shaft axis and are perpendicular thereto, and a force-transmitting and
torque-transmitting connection exists between pump legs disposed opposite
one another in the direction of the shaft axis. In this manner, it is
possible to indirectly or directly connect a motor in the region of the
suction and pressure nozzles of the lower housing part. By appropriate
design of the flanges of the suction and pressure nozzles, mounting can be
very easily accomplished.
An embodiment of the invention provides for respective facets to be
disposed opposite one another in pairs. This enables manufacture to be
simplified and an ideal force and torque flux to be obtained.
A further embodiment of the invention provides for masses of material
applied to the lower housing part in the region of the flange segment to
constitute part of the facets. For cast housings, in particular, larger
facets, and thereby a maximum as regards the loads to be absorbed, can be
achieved by simple industrial casting design. Such facets can likewise be
readily produced in welded structures. Moreover, it accordingly becomes
possible to use standardized elements, e.g., steel shapes among others,
for attachment.
Still another embodiment provides for pump legs disposed opposite one
another in the direction of the shaft axis to be connected to each other
in force-transmitting and torque-transmitting relationship by means of
inserts, adjusting elements or the like. In this manner, a rigid
connection between two pump legs can be obtained through the simple
interposition of intermediate elements. By virtue of an additional
embodiment in which the pump legs are provided with openings for tie rods,
the components to be secured can be clamped to one another. Instead of the
tie rods, it is also possible to provide the facets with fastening means
to thereby connect the casing of a motor, for example, directly to the
facets.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is an elevational view of the front side of the housing,
FIG. 2 is a plan view of the lower housing part and
FIG. 3 shows a vertical installation with a block motor secured by a
flanged connection.
DESCRIPTION OF PREFERRED EMBODIMENTS
The illustration of FIG. 1 shows a centrifugal pump housing 1 which
consists of an upper housing part 2 and and a lower housing part 3. Flange
segments 4 connect the two halves of the housing. The lower housing part 3
has a suction nozzle 5 and a pressure nozzle 6 as well as pump legs 8,9
which are mounted thereon. The lower housing part further has facets 10,11
in the region of the flange segment and facets 12,13 on the pump legs.
These facets are located in a plane which intersects the shaft axis 14 and
is perpendicular thereto. The facets 10-13 can be arranged in two or more
parallel planes. A motor which is not illustrated here and is to be
indirectly or directly secured to the lower housing part comes to rest
against these facets. Fastening means 15, here threaded holes, simplify
direct attachment to these facets. Openings 16 in the pump legs 8,9 allow
clamping by means of through tie rods. These can also be disposed next to
the pump legs.
In FIG. 2, which is a plan view of the lower housing part, two planes 16,17
containing the facets 10-13 are shown by dash-and-dot lines. It is readily
possible for the facets 12,13 on the pump legs 8,9 to lie in the same
planes or in other planes parallel thereto. The bearing cages which carry
the pump shaft can be mounted on the flange surfaces 18,19 located in the
region of the front sides of the housing. A bearing arrangement within the
housing is possible. The facets 10,11 disposed in the region of the flange
segment 4 here constitute part of masses 22 of material which, for a cast
housing, can be readily cast as part of the same. It is also possible to
provide the facets 10-13 on the suction and pressure nozzles 5,6, either
additionally or exclusively, to thereby create further possibilities for
securing the motor.
FIG. 3 shows a vertically installed pump housing 1 provided with a motor
20. The motor 20 is coupled to the facets 10-13 of the lower housing part
via a casing 21. The casing 21 is secured to one of the front sides of the
housing while the pump rests by way of the other front side of the housing
on U-shaped carriers 23 which are connected with a foundation 24. A
connection between the casing 21 and the carriers 23 is established in the
region of the flange segment by fastening means 15, here screws, which
extend into threaded bores of the facets 10,11. In the area of the pump
legs 8, which are formed as a one-piece cast section with the lower
housing part so that these are joined for force transmission from one to
the other, the components are held together via tie rods 25 which clamp
the casing 21, the pump legs 8 and the carriers 23 to one another.
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